Blue anthracene dye.



No. 775,368. Patented November 22, 1904.

UNITED STATES PATENT OFFICE.

MAX KUGEL, OF VVIESDORF, NEAR COLOGNE, GERMANY, ASSIGNOR TO FARBENFABRIKEN OF ELBERFELD 00., OF NEV YORK, N. Y., A COR- PORATION OF NEWV YORK.

BLUE ANTHRACENE DYE.

SPECIFICATION forming part of Letters Patent No. 775,368, dated November 22, 1904. Application filed July 21, 1904. Serial No, 217,529. (No specimens.)

To 111/ whom, if 772/!1 concern.-

Be it known that 1, MAX KUGEL, doctor of philosophy, chemist, residing at Viesdorf, near Cologne, Germany, (assignor to the FAR- BENFABRIKEN or ELBERFELD (30., of New with cupric chlorid in the presence of a suit- York,) have invented a new and useful Imable dissolving or diluting agent, and preferprovement in Anthracene Dyes; and 1 hereby ably with the addition of a product having a declare the following to be a clear and exact weak alkaline reaction, such as sodium acedescription of my invention. tate or the like. The reaction proceeds most My invention relates to the manufacture of probably according to the following equation:

was on In carrying out the process practically I I can proceed as follows, the parts being by weight: A mixture of twenty parts of l-methylamido 2 bromoanthraquinone, two hundred parts of nitrobenzene, ten parts of pulverized anhydrous sodium acetate, and one-half part of cupric chlorid (CuClz) is heated to 1 boiling for about five hours while stirring. WVhen cold, the microscopic needles thus obtained are filtered off, washed with nitrobenzene, alcohol, and hot water.

My new coloring-matter thus obtained represents blue microscopic needles having a metallic luster. It is soluble in hot nitroben- Zene, anilin, and quinolin with a greenishblue color and soluble in concentrated sulfuric acid with a yellowishbrown color. Upon treatment with hydrosulfite and causticsoda lye it is transformed into its hydro compound, the alkaline solution of which has the properties of a vat suitable for dyeing and printing unmordanted cotton, pure blue fast shades being thus obtained.

Having now described my invention and in a new dyestufi', being a hydroazin derivative of the anthracene series. The process for producing this coloring-matter consists in heatin g the 1Inethylamid0-2-bromoanthraquinone what manner the same is to be performed, what I claim as new, and desire to secure by Letters Patent, is

The herein-described new dyestuff being a hydroazin derivative of the anthracene series obtainable by heating 1-methylamido-Q-bromoanthraquinone with cupric chlorid and a suitable liquid, which dycstufl represents blue microscopic needles soluble in hot nitrobenzene, anilin and quinolin with a greenish-blue and soluble in concentrated sulfuric acid with a yellowish-brown color; being transformed into a hydro compound on suitable reduction with hydrosulfite and caustic-soda lye. the alkaline solution thus obtained exhibiting the t.vpical properties of a vat which dyes unmordanted cotton pure blue shades, substantially as hereinbefore described.

In testimony whereof I have signed my name in the presence of two subscribing witnesses.

MAX KUGEL.

\Vitnesses:

O'r'ro KONIG, HEINR. AiiLnFELDm-z. 

